Mining-machine.



A A. H. GIBSON.l

MINING MAGHINB.

APPLIUAATION FILED SBPTJI, 1912. i.

'Patented May 12, 1914.

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A. H. GIBSON.

MINING MACHINE.

APPLIOATION FILED SEPT. 7, 1912.

Patented May 12, 1914.

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n UNITED STATES ITENT OFFICE.

ARTHUR HENRY GIBSON, OF EASTON, PENNSYLVANIA, ASSIGNOB, TO INGERSOLL- RAND COMPANY, F NEW YORK, N. Y., A CORPORATION 0F NEW JERSEY.

MINING-MACHINE.

Specification of Letters Patent.

Patented May 12, 1914.

Application filed September 7, 1912. Serial No. 719,186.

To all whom it may concern:

Be it known that I, ARTHUR H. GIBSON, a subject of the King of Great Britain, resid* ing at Easton, in the county of Northampton and State of Pennsylvania, have invented a certain new and useful Improvement in Mining-Machines, of which the followingV is a specification.

This invention relates to mining machines and more particularly to fluid operated coal picks used for cutting entries in coal mines.

The object of the present invention 'is to improve the construction of such devices by l5 strengthening the forward portion of the front head shell.

further object is to arrange the passage of the air from the exhaust so that the noise occasioned by lthe exhaust will be mufied. This is an important feature in a coal machine as the exhaust from a large machine often renders it impossible for the operators to hear the coal in the roof of the shaft cracking as it frequently does, and

they have no time to escape from under the the accompanying drawings in which:

Figures 1 and 1a are a longitudinal section through the complete puncher, Fig. 2 is a detail showing the valve, Fig. 3 is a horizontal section taken on the line 3-3 of Fig. 1 and Fig. 4 is a transverse section on the line H of Fig. 3.

The puncher as shown comprises a cylinder 1, in which reciprocates a piston 2 to which is attached a long piston rod 3, to

the forward end of which is attached the pick (not shown). Forward of the cylinder is a rectangular front head 4 in the front face of which is an annular groove 5 in which rests the rearward edge of a cylindrical sleeve 6 which forms part of the drill shell, forward of this is a sleeve 7 which tapers toward its forward end. Between these two sleeves is a shouldered ring 8, against the opposite faces of which the two Fitting around the sleeve 7 is a retaining piece 9, having a cylindrical opening tting the taper of the sleeve 7. At the rear end of the drill is a heavy back head 10 serving to balance the long forward part of the shell. Bolts 11 pass through the back head and the retainmg piece 9 which secure the back head, the drill cylinder, the head block and the two sleeves firmly together in alinement. Bearings for the piston rod are provided by the sleeve 12 in the forward end of sleeve 7 and by a sleeve 13 secured to the ring 3. A further bearing is also secured by a sleeve 14 which -is provided with perforations 14a through which oil from an oil box 15 can reach the piston rod. The oil box 15 is filled with cotton waste and is secured to the front head by screw bolts 16.

The valve as shown is of the type described in the patent to Bayles, Reissue #13317 and'consists of a winged valve 17 which controls inlet passages 18 and 19 to the ends of the cylinder and exhaust passages 2O and 21 from points in the cylinder nearer the center than their respective inlet passages. The air from the exhaust passages passes into a chamber 22 and from thence travels by a passage 23 to a chamber 24 in the top of the cylinder casing which is covered by a plate 25. From here the exhaust flows by two passages 26, 27 in the cylinder casing, through corresponding apertures 28, 29 in t-he head block and along side of bloclr 15 into the space formed by the sleeve 6 finally exhausting to the atmosphere through ports 30 in the sleeve 6. The passage of the exhaust through this series of chambers inutiles its sound to a large extent.

The division of the long forward shell of the drill into two parts and the securing of these parts together and to the cylinder and back heads avoids the breaking of the forward part of the drill shell which frequently occurs unless the shell is made of a prohibitive thickness and weight.

It is to be understood that the present showing and description discloses only one specified modification of my invention and other forms and modifications are included in the spirit and scope of the invention as expressed in the claims.

What I claim is:

1. In a mining machine, a cylinder, its piston, fluid inlet and exhaust passages for said cylinder, a chamber on said cylinder into which said fluid exhausts, an elongated shell forward of the cylinder having a plurality of exhaust openingsyand means for conveying the exhaust4 fluid from said chamber into said forward shell.

2. In a mining machine, a piston, a piston rod attached to said piston, shell consisting ofapluralityof sleeves, a a 'valve chest, a chamber for receiving the retaining piece engaging thefo'rward sleeve, 15 exhaust fluid from said valve chest, an elonand bolts securing `Said retaining piece, gated shell forward of said cylinder for sleeve, front head, drill cylinder and back guiding said piston rod, said shell having a head 'together and in alinernent. plurality ofexhaust openings, and restrictl In testimony whereof, I have hereunto ed passages for conveying the exhaust fluid i set niy hand. from said chamber into said forward shell. r ARTHUR HENRY GIBSON.

3. In a mining machine, a cylinder, its. Vitnesses: piston, a back head and front head for said ROBERT E. KIEFFER, cylinder, an elongated shell forward of said 4 W7. F. SMITH.

cylinder, its front head for guiding said piston rod, said Copies of this patent may be obtained for :tive cents each, by addressing ythe "Ciiiiniisioner rot Patents,

Washington, D. C. 

